package com.example.shengyin.webSocket;

/**
 * @author oldliu
 * @since 1.0
 */

import java.text.MessageFormat;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson2.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import lombok.extern.slf4j.Slf4j;

@Component
@Slf4j
@ServerEndpoint("/websocket/{userId}")  // 接口路径 ws://localhost:8087/webSocket/userId;
public class WebSocket {
    //@Autowired // 未读
    private static MessageService messageService;
    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;
    /**
     * 用户ID
     */
    private String userId;

    @Autowired
    public void setMessageService(MessageService s) {
        messageService = s;
    }

    //    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    //虽然@Component默认是单例模式的，但springboot还是会为每个websocket连接初始化一个bean，所以可以用一个静态set保存起来。
    //  注：底下WebSocket是当前类名
    private static CopyOnWriteArraySet<WebSocket> webSockets = new CopyOnWriteArraySet<>();
    // 用来存在线连接用户信息
    private static ConcurrentHashMap<String, Session> sessionPool = new ConcurrentHashMap<String, Session>();

    /**
     * 链接成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam(value = "userId") String userId) {
        try {
            this.session = session;
            this.userId = userId;
            webSockets.add(this);
            sessionPool.put(userId, session);
            System.out.println(">>>>>>>>" + userId + "加入了聊天" + this.messageService);
            log.info("【websocket消息】有新的连接，总数为:" + webSockets.size());
//            if ("laoliu".equals(userId))//未读消息
//            {
            for (String allMe : this.messageService.getAllMes(userId)) {
                this.sendOneMessage(userId, allMe);
            }
            //}
            this.sendAllMessage(userId + "  成功登录");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 链接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        try {
            webSockets.remove(this);
            sessionPool.remove(this.userId);
            log.info("【websocket消息】连接断开，总数为:" + webSockets.size());
        } catch (Exception e) {
        }
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message
     */
    @OnMessage
    public void onMessage(String message) {
        log.info("【websocket消息】收到客户端消息:" + message);
        JSONObject msgJson = JSONObject.parseObject(message);
        String to = msgJson.getString("to");
        String msg = msgJson.getString("msg");
        if ("all".equals(to))
            this.sendAllMessage(message);
        else
            this.sendOneMessage(to, msg);
    }

    /**
     * 发送错误时的处理
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {

        log.error("用户错误,原因:" + error.getMessage());
        error.printStackTrace();
    }


    // 此为广播消息
    public void sendAllMessage(String message) {
        log.info("【websocket消息】广播消息:" + message);
        for (WebSocket webSocket : webSockets) {
//            if (webSocket == this)
//                continue;
            try {
                if (webSocket.session.isOpen()) {
                    webSocket.session.getAsyncRemote().sendText(message);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    // 此为单点消息
    public void sendOneMessage(String userId, String message) {
        Session session = sessionPool.get(userId);
        if (session != null && session.isOpen()) {
            try {
                //if(session.getAsyncRemote().)
                log.info("【websocket消息】 单点消息:" + message);
                session.getAsyncRemote().sendText(message);
                Thread.sleep(100);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    // 此为单点消息(多人)
    public void sendMoreMessage(String[] userIds, String message) {
        for (String userId : userIds) {
            Session session = sessionPool.get(userId);
            if (session != null && session.isOpen()) {
                try {
                    log.info("【websocket消息】 单点消息:" + message);
                    session.getAsyncRemote().sendText(message);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }

    }

}
